单项选择题

Which of the following can NOT be inferred from the passage

A．The faculty of speech is reborn in man.
B．Encouragement is anything but essential to a child in language learning.
C．The child's brain is highly selective.
D．Most children learn their language in definite stages.
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单项选择题
The purpose of Frederick I's experiment was ______.
A．to prove that children are born with the ability to speak
B．to discover what language a child would speak without hearing any human speech
C．to find out what role careful nursing would play in teaching a child to speak
D．to prove that a child could be damaged without learning a language
单项选择题
The reason some children are backward in speaking is most probably that ______.
A．they are incapable of learning language rapidly
B．they are exposed to too much language of once
C．their mothers respond inadequately to their attempts to speak
D．their mothers are not intelligent enough to help them
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